大径杉木人工复层林的经营模式

对29 a生杉木林下进行不同强度间伐后套种阔叶树种营造人工复层林,以探索人工林经营新模式。结果表明:当间伐后林分郁闭度降至0.4-0.5时,可满足喜光阔叶树幼树生长;当郁闭度降至0.6时,耐荫阔叶树幼树能正常生长。观光木和火力楠是理想的杉木林下套种树种,枫香不宜在林下套种。29 a生杉木近熟林林分间伐后4 a,胸径生长与密度呈反比关系,不同密度下的杉木胸径生长差异达到极显著水平。

Management model of multi-storied Chinese fir plantation

A new management model of plantation was explored through interplanting the broadleaved tree species under the growth of 29-age Chinese fir plantation with different thinning intensity.The results showed that the young light-demanding broadleaved saplings grew well after the stand canopy density was thinned by 0.4-0.5.And the young shade-tolerant broadleaved saplings grew well when the canopy density was thinned by 0.6.Both Tsoongiodendron odorum and Michelia macclurei were ideal species interplanting under the thinning Chinese fir plantation,but Liquidambar formosana was not.4 years after various thinning intensity was carried on for the 29 year old Chinese fir plantation,it was showed that there was an inverse relationship between the growth of DBH(diameter at breast height) and stand density,and the differences of the growth of DBH of various stand density reached an extremely significant level.